1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f99b98a33929379a9f5ea60b919b9a72b75f3cfb746fd00e6f64aff3b7de51. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a46257ea-c918-403e-9080-0028fa777a1f.json and https://artists.proofprofile.net/proofs/artist/a46257ea-c918-403e-9080-0028fa777a1f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8df6d15b3dbfc4eb883d39888a234007129e1922862b6142214fc91b70259c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG731661266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4637263ac3d959cebbd85527824367e940af3018918d1b222908e8c027e71038. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732332451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca86c9fcb443bcaaf285aacce327d4928757733e23da68477de2c583a6a79645. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732261816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109977e11d9fcf6798f93ac2bbe8c12e4540f4ad8a7557398b938550f6fd67f5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA052492382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19dbfe26d27dc902a54ffee4441cda76471ce3c0701b4f5fc3197be89948e15e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX762496639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4b706a118179ab250911f1e896304ead3e4b1ae99482e7c8d8e3629cd29c67. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA0R2335671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc2e0ca422ef80611e32f1f4f163257634b29ae3afbfe16aeba99c13e5f3703. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA0H2311075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebb03ed546342865d9e98c029b8b9568e79b7765cac98ef437239a948f0cd0f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732267723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4abf41ebe140166d7a7e7a68a5dcb10cac445647f9e3699ca84eef0721185ae. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732264826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2288351a51b6af668688d5a90dfe9c39064ab4018651265b1bf4e8fccdfdf68f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA092359074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b2906d86dcedda24bf85a9a427a204e741de378bf3486f3f9f57930ac69e0d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR59R2265774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedada857481df20eabe45ae28386a3e4f9b2eef50c1e8efb34edd8b8283caa4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA0L2365575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43e6a8e24a75d2ccd63ba25c315eaf1cdce717bbb66bda0e71891da5a8794c5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX872181345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1477b320818681cfc64d0a12d981ecb9083ab7c06ecb4fd7e216c4cf4173a926. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR59R2529751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1684f4d828fa1ff71184652b2eabcc44b361e999b6d3a9496790f619798129. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG732497347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72880cbf8c320d1cc3040efb0158f4bb4bb70991b8def9225254386894a2eba6. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG731401950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6d6a8a827b65af028695d241af568192cded3ba2421b357ca9656228588103. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKG731407347.